Valve of internal-combustion engines.



F. PORSCHE.

VALVE OF INTERNAL COMBUSTION ENGINES.

v APPUCATION FILED APR. 0, I914.

Patented Jan. 25, 1916.

FERDINAND PORSCHE, OF WIENER-NEUSTADT, AUSTRIA-HUNGARY.

VALVE 0F INTERNAL-COMBUSTION ENGINES.

Specification of Letters Patent.

Patented el an. 25, 1916.

Application filed April 10, 1914. Serial No. 830,881.

To on whom it may concern:

Be it known that I, FERDINAND PORSCHE, engineer and acting manager ofthe Oesterreichische Daimler-Motoren Aktiengesellschaft, ofWiener-Neustadt, a subject of the Emperor of Austria-Hungary, residingat VViener-Neustadt, Lower Austria, in the Empire of Austria-Hungary,have invented certain new and useful Improvements in or Relating toValves of Internal-Combustion Engines, of which the following is aspecification. v

This invention relates to a type of valve gear for internal combustionengines in which both valves are operated by an oscillating leveractuating the two valves alternately against the influence of a commonplate spring.

The feature of novelty resides herein that the plate spring, instead ofbeing mounted as in similar constructions on a statlonary member, isattached to the oscillating lever actuating the valves so that itpartakes of the movements of the lever. By this means upon the openingof one of the valves the load upon the other valve due to the spring isincreased while on the other hand the load upon the opening valve isdiminished.

.A mode of construction for this arrangement of spring is illustrated inthe accompanying drawings as an example, F lgu-re 1 showing the upperpart of a cylinder in section and the valves while Fig. 2 is a broken"detail view partly in section on the line A--A of Fig. 1.

Referring to the drawing the valves 2 and 3 arranged at the end -of thecyllnder 1 are supported, by means of projections or abutments 6 on thecorresponding valve rods4 and 5, which engage with the ends'of a spring7 which may be a leaf-spring or plate spring or equivalent adapted tonormally hold the valves totheir seats. The leafspring 7 is supported atits central portion by an oscillating lever 8 adapted to actuate thevalves. The lever 8 is rotatably mounted on a pin 9 between standards 10on the end of the cylinder and when oscillated actuates the valve rodsby means of contact portions which may be rounded or formed as curvednoses, as illustrated. Onearm of the lever which is prolonged is in aknown manner pivotally connected to a cam rod 11 subjected to theinfluence of a cam (not shown) so that the valves are alternately openedby the oscillations of the lever set when the spring is up by the cam.The leaf-spring 7 is suitably secured to the lever 8 by providing thelever below its pivot pin with a right-angled eye 12 into which the leafspring is inserted see Fig. 2 and held fast by a set screw 13 or by akey.

Since the spring is rigidly connected to the lever and thereforeendeavors to partake of the oscillating movements of the lever that armof the spring which engages with a valve in the course of being openedwill thus undergo a relaxation of tension and consequently diminish theload upon that valve whereas the other arm of the spring will besubjected to increased tension so that the valve which happens to be inthe closed position'will be held to its seat with a correspondinglyincreased pressure. The strength of the spring is so designed that whenone valve has been quite opened the maximum pressure affecting the othervalve and due to the other portion of the spring corresponds to thespring pressure normally taking effect on the valves when closed and dueto a plate spring secured on to a stationary member or to spiral-springsas usually employed. The result of this is, that when the lever is inmidposition and both valves are therefore closed, the pressure exertedon the valves is considerably less than secured to a stationary memberthat is to say when the spring does not partake of the oscillatingmovements of the lever so that at the moment when the actuation of theone or the other of the valves commences a considerably lesserresistance has accordingly to be overcome whereby a much quieter and amore elastic operation of the whole valve gear'is attainecl.

While I have described and shown a suitable construction it should beunderstood that various modifications may be introduced withoutdeparting from the scope of my said invention.

What I claim is 1. In an internal combustion engine, the combination .ofadmission and exhaust valves, opening means for actuating said valvesalternately to open them alternately, and elastic means tending to closesaid valves controlled by the operation of said opening means so thatthe tension and load on a closing valve is increased, while the load onan opening valve is diminished.

2. In an internal combustion engine, the

combination of admission and exhaust valves, an oscillating lever foractuating said valves alternately to open them alternately, and elasticmeans for closing said valves alternately and partaking of theoscillating movements of said lever, whereby the load on a closing valveis increased while the load on an opening valve is diminished.

3. In an internal combustion engine, the combination of admission. andexhaust valves, an oscillating leverfor opening said valves alternately,and a plate spring for closing each of said valves, when said valves arereleased by said lever, said spring partaking of the oscillatingmovements of said lever, whereby the load on a closing valve isincreased while the load on an opening valve is diminished.

4. In an internal combustion engine, the combination of admission andexhaust valves, an oscillating lever for opening said valvesalternately, and a plate spring adapted when said lever is inmid-position, to hold both of said valves closed with equal pressure,and to oscillate in unison with said lever, as it moves from saidmid-position, whereby the load on a closing valve is increased while theload on an opening valve is diminished.

5. In an internal combustion engine, the combination of admission andexhaust valves, an oscillating lever for opening said valvesalternately, and a plate spring tending to close said valves, andsecured to said lever so as to partake of its oscillating movements,thereby increasing the load on one of said valves when closed anddiminishing the load on the other valve.

6. In an internal combustion engine, the combination of admission andexhaust valves, an oscillating lever for opening said valvesalternately, a pivoted plate spring tending to close said valves, andmeans whereby said spring is caused to oscillate in unison with saidlever, whereby the load on a closing valve is increased while the loadon an opening valve is diminished.

7. In an internal combustion engine, the combination of admission andexhaust valves each. valve being provided with a stem, and a pivotedlever adapted when oscillated to actuate said stems alternately so as toopen the corresponding valve, abutments on the free ends of said stems,a spring having each end adapted to engage with the abutments on thecorresponding stem, a

seating for said spring centrally located on said lever with respect toits length, means for rigidly securing said spring to said seating.

8. In an internal combustion engine, admission and exhaust valves,opening means for actuating said valves alternately to open themalternately, said opening means moving toward said valves to open them,and withdrawing from saidwalves when said valves are to remain closed,elastic means constantly tending to maintain said valves in a closedposition, and connecting means intermediate said elastic means and saidopening means, said connecting means causing the force of said elasticclosing means for said valves to be less when said opening means aremoving toward said valves than when said opening means are moving awayfrom said valves.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

FERDINAND PORSCHE.

Witnesses:

CARL BRAi'JNnn, KARL Hanan.

and

